411A
Are there any partial oil loss or total oil loss engines still in use?
Still quite a few Darts in service, worldwide.
A really fine engine.
Its been thirty-odd years, but I am pretty sure the RR Dart was not a total or partial loss system.
I think you may be mixing it up with the Viper as fitted to Jet Provost, and some earlier powerplants.
Re; Dart
Within its limits (cycles) it was a simple and dependable powerplant